火箭推进2018，Vol.44Issue(3)：16-22,7.
液体火箭发动机管路断裂失效分析及动力优化
Failure analysis and dynamics optimization of pipeline for liquid rocket engine
摘要
Abstract
The safety and reliability of pipeline system for liquid rocket engine are the key issues to safe operation of engine. Aiming at the fracture failure of rocket engine pipeline, a new failure analysis method and dynamic optimization design of the pipeline are proposed. Firstly, the vibration control meas-ures were put forward based on the mechanism analysis and fault recurrence. Then the front and rear chamfers of the failure pipe joint were treated as design variables, while the minimum dynamic stress at the two chamfers was served as the objective function. The dynamics optimization model design and dynamic strength optimization design based on shape optimization were conducted by using the structure frequency restricted zone as a constraint. Lastly, the damage quantitative analysis of random vibration fatigue of the structure under base-excitation was carried out for the joint structure. In addition, the im-proved approach was validated by fatigue test. It is concluded from the research that the dynamics optimi-zation of pipeline structure can improve the mechanical environment adaptability and structural relia bili-ty, and the effectiveness of improvement measures is verified. The established methods of structural fail-ure analysis and dynamics optimization design provide technical support for the project development.关键词
管路断裂/优化设计/液体火箭发动机/失效分析Key words
pipeline failure/optimization design/liquid rocket engine/failure analysis分类
航空航天引用本文复制引用
杜大华,穆朋刚,田川,周建,程晓辉..液体火箭发动机管路断裂失效分析及动力优化[J].火箭推进,2018,44(3):16-22,7.基金项目
国家自然科学基金青年基金(11702204) （11702204）
装备预研共用技术和应用基础(2017ZZB·YY4001Da) （2017ZZB·YY4001Da）
